Day 1: Report RepairDay 2: Password PhilosophyDay 3: Toboggan TrajectoryDay 4: Passport ProcessingDay 5: Binary BoardingDay 6: Custom CustomsDay 7: Handy HaversacksDay 8: Handheld HaltingDay 9: Encoding ErrorDay 10: Adapter ArrayDay 11: Seating SystemDay 12: Rain RiskDay 13: Shuttle SearchDay 14: Docking DataDay 16: Ticket TranslationDay 17: Conway CubesDay 18: Operation OrderDay 19: Monster MessagesDay 25: Combo BreakerAdvent of Code Leaderboard 2020
Day 15: Rambunctious Recitation
input = '7,12,1,0,16,2'
function* run(input) {
const start = input.trim().split(',').map(Number)
const ever = {}
for (let n = 0; n < start.length - 1; n++) {
yield start[n]
ever[start[n]] = n
}
let n = start.length - 1
let last = start[n]
while (true) {
const next = last in ever ? n - ever[last] : 0
yield last
ever[last] = n++
last = next
}
}
part1 = {
let n = 1
for (let r of run(input))
if (n++ === 2020)
return r
}
part2 = {
let n = 1
for (let r of run(input))
if (n++ === 30000000)
return r
}
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